On Mar 20, 2009, at 16:55, lemons_terry AT emc DOT com wrote:
The Data Domain systems do not support writing directly to tape
devices.
So, in order to create a tape copy of a backup on the central site DD
system, the data will need to be read from the DD system into a
NetWorker storage node and then written by a storage node to the tape
device.
I was under the impression that (some?) DD systems can actually
replicate to other DD systems transparently without third-party
software. You go into the DD config and say "send the data to this
other DD unit".
This helps in that you only send non-duped data to the other DD unit.
With a NetWorker clone, you would stream the entire save set's data--
including blocks that are already on the central DD unit. You would
save on time and bandwidth by having the DDs only send the de-duped
stream.
Is this a correct assessment of the DD functionality? If so, would you
tell NetWorker about the second copy of data that the DD units sent
over on their own?
To sign off this list, send email to listserv AT listserv.temple DOT edu and type
"signoff networker" in the body of the email. Please write to networker-request
AT listserv.temple DOT edu if you have any problems with this list. You can access the
archives at http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
|
